Cocktail shaker



FIG. 1 is a top perspective view of a cocktail shaker showing our new design;

FIG. 2 is a front side view thereof;

FIG. 3 is a back side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left perspective view thereof;

FIG. 6 is a top perspective view thereof; and,

FIG. 7 is a bottom perspective view thereof. 

CLAIM The ornamental design for a cocktail shaker, as shown and described. 